title: Xanthone glycoside constituents of Swertia kouitchensis with α-glucosidase inhibitory activity.
abstract: Ten new xanthone glycosides, kouitchensides A-J (1-10), and 11 known analogues were isolated from an n-butanol fraction of Swertia kouitchensis. The structures of these glycosides were determined on the basis of extensive spectroscopic data interpretation and comparison with data reported in the literature. In an in vitro test, compounds 2, 4, 5, 6, 11, 12, and 13 (IC50 values in the range 126 to 451 μM) displayed more potent inhibitory effects against α-glucosidase activity than the positive control, acarbose (IC50 value of 627 μM).
authors.affiliation: Hubei Key Laboratory of Natural Medicinal Chemistry and Resource Evaluation, Pharmaceutical Science Department of Tongji Medical School, Huazhong University of Science and Technology, Wuhan 430030, People's Republic of China.
authors.forename: Luo-Sheng
authors.initials: LS
authors.lastname: Wan
authors.forename: Qiu-Xia
authors.initials: QX
authors.lastname: Min
authors.forename: Yong-Long
authors.initials: YL
authors.lastname: Wang
authors.forename: Yao-Dong
authors.initials: YD
authors.lastname: Yue
authors.forename: Jia-Chun
authors.initials: JC
authors.lastname: Chen
mesh_terms: D020001:1-Butanol; D004365:Drugs, Chinese Herbal / Q000737:chemistry / Q000302:isolation & purification* / Q000494:pharmacology*; D065089:Glycoside Hydrolase Inhibitors; D006027:Glycosides / Q000737:chemistry / Q000302:isolation & purification* / Q000494:pharmacology*; D020128:Inhibitory Concentration 50; D015394:Molecular Structure; D019906:Nuclear Magnetic Resonance, Biomolecular; D012441:Saccharomyces cerevisiae / Q000201:enzymology; D029967:Swertia / Q000737:chemistry*; D044004:Xanthones / Q000737:chemistry / Q000302:isolation & purification* / Q000494:pharmacology*
chemical_list: D004365:Drugs, Chinese Herbal; D065089:Glycoside Hydrolase Inhibitors; D006027:Glycosides; D044004:Xanthones; D020001:1-Butanol